All you people that are lucky enough to upgrade all your electronics.... Anyhow, I'm looking for a decent used guage to plug into the existing depth guage bulkhead mount. The boat currently has what I suspect are the original knot and depth meters--Kenyon, a company no-longer in existence.... Problem is, most guages are standardized to 2 1/2, 2 3/8 or so mounting holes; my current (basically useless) guages are 4 or so inches in diameter. And without resorting to painstaking glass work, I'm stuck with these mounting holes. Does anyone know of some decent guages that will fit this sized opening? I just need depth and/or knots, not fishfinder or GPS or anything like that. Regards,Adam